Northbound motorists can expect slower traffic, and sometimes stopped traffic, in the area north of the Lehigh Valley Interchange in South Whitehall, she said.

"Motorists are urged to obey posted 40 or 55 mph speed limits and use extra caution when approaching all work areas," Doyle said. "Construction zone speed limits are enforceable, and fines will be increased."

The reconstruction work will go ahead only if the weather cooperates, she said.